公开(公告)号：US11736013B2

公开(公告)日：2023-08-22

申请号：US17566678

申请日：2021-12-30

Applicant: Richtek Technology Corporation

Inventor： Shei-Chie Yang ,  Jian-Yu Tu ,  Yuan-Yen Mai ,  Pao-Hsun Yu

IPC: H02M3/158 ,  H02M1/00

CPC classification number: H02M3/1582 ,  H02M1/009

Abstract: A buck-boost switching regulator includes: a power switch circuit including an input switch unit and an output switch unit which switch a first terminal and a second terminal of an inductor for buck-boost conversion; at least one low dropout regulator correspondingly coupled to at least one output high side switch in the output switch unit to correspondingly convert at least one low dropout voltage into at least one output voltage; and a bypass control circuit configured to operably generate a bypass control signal according to a conversion voltage difference between the input voltage and the corresponding low dropout voltage; wherein when the corresponding conversion voltage difference is lower than a reference voltage, the bypass control signal controls a corresponding bypass switch to electrically connect the input voltage with the corresponding low dropout node.

公开(公告)号：US20220224233A1

公开(公告)日：2022-07-14

申请号：US17566678

申请日：2021-12-30

Applicant: Richtek Technology Corporation

Inventor： Shei-Chie Yang ,  Jian-Yu Tu ,  Yuan-Yen Mai ,  Pao-Hsun Yu

IPC: H02M3/158 ,  H02M1/00

Abstract: A buck-boost switching regulator includes: a power switch circuit including an input switch unit and an output switch unit which switch a first terminal and a second terminal of an inductor for buck-boost conversion; at least one low dropout regulator correspondingly coupled to at least one output high side switch in the output switch unit to correspondingly convert at least one low dropout voltage into at least one output voltage; and a bypass control circuit configured to operably generate a bypass control signal according to a conversion voltage difference between the input voltage and the corresponding low dropout voltage; wherein when the corresponding conversion voltage difference is lower than a reference voltage, the bypass control signal controls a corresponding bypass switch to electrically connect the input voltage with the corresponding low dropout node.